Plug socket



l .DI:.1 75 19,35. g.f, L. S*I RolgcgsoNVH l ,2,(m4547k i Y PLUG SOCKET l *Y "Original Filed April 2l, 1925 l ii; .l

j Patented Dec. 17, 1935 p STATES PxrlaNfrv OFFICE] v 2,024,541 o n y v *n PLUG s ocimrV l. v i i n i Herman Ii. Strongsom Syracuse, N. Y., assignor to 1leliard Colen, Great Neck, Longlsland, i

Application- April-21, 1926, serial No. 103,502

lRenewed September 13, 1932 26 Claims, (Cl. HSP-328) v'This invention relates primarily to electric soft rubber base before the metal contact parte push plug connections, base receptacles, plug are assembled therewith.` sockets, etc. In particular it relates to orirather Figure '7 is a diagram illustrating the prinvit is shownas anexampleof new mounting means ciple of the invention and serving to show how 5 as a cushion socket for audions, electric vacuum `the cushion socket base itself, the material of 5 tubes, and the like. A f f which it is made, possesses inherent elastic flex- An object of the inventionV is `to produce e. new ure or compressibility which property is utilized type of electrical plug-in connection or `base rerfor the several purposes heretofore named.

y ceptacle by which separable electrical circuits are Figure 8` shows a modified form of the invenlil connected and this purpose is carried, out withtion, a lfeature being. an improved means of 1o out employing spring metal conta/ct` members. mounting a cushion socket or any number there- A further object ofpthe invention-,is to proof on a vacuum or radio tube panel. duce `a new type support or'cushion socket' for Referring further to the drawing, as to Fig- 1 i vacuum tubes and I employ elastic material for -ures 5 and 6, for an understanding of the first iii this purpose to simplify.` the construction and form of the invention, there is shown an integral i5 reduce the cost ofmanufacture` and at the same base 9 preferably molded of rubber because of time produce -a socket which possesses shock the fact that it possesses the desired property of absorbing properties and which is non-microelasticityor yieldability,compression, and flexphonic. i i v4ure without at thesame time having the obl 20 A further object of the invention is to produce jectional property' of magnifying vibration as 2o i a cushioning socket for electric vacuum tubes, characteristic ofvcoil springs and the like. In the base or body of which is made entirelyof other words, a rubber. cushion base does not elastic, yieldable, or compressible material, as have a period of vibration and is not sensitive to for examplerubber, the object being to utilize vmovement of outside bodies and does not acquire the compressible member" with its inherent spring y or take on motion within itself because of the g5 or elastic 'properties to accomplish several purdensity of its mass which tends to absorb shock poses; namely, to avoid all necessity ofexible and damp out attendant vibration. The elastic metal spring contacts in a vacuum tube mountbase 9 is molded'in any suitable shape, a satising or support or in any other plug connect factory form for many purposes being disk-like 30 ingelement, to also` afford/'a shock Iabsorbing asshown. C V 36. mounting means forthe tubebywhich vibrations The rubber base is molded elastically, that is, 4are damped out and Aeliminated to protect the. to retain its elasticityv asdistinguished from the tube, and toemploytheicompressible member as l molding of hard rubber, in any suitable socket a base and insulating mounting 'means to hold formand the one shown here is a'mere example 35' the contacts. I of a base for one vacuum tube socket but it may 35 Having the .above and'-` other objects in view, be made for several vacuum or radio tubes. The the principles of the invention will now. be debase `9 has apertures lmolded therein for the scribed, and an example thereof is shown inthe lreception of eyelet receptacle contact parts.- The acccnppanying drawing wherein: four holes l0, or any suitable number, are molded 49 Figure 1 shows 9, bottom View .of the Socket; into the integral elastic body 9 and thereafter ce and Figurev 2 shows a section through Figure 1 the COIltt'Pal'tS are assembledin the base. The on the une 2 2f l j y holes Il) are, in some forms of therinvention, Figure 3 shows avacuum tube oris anexamshouldered at the upper end thereof t0 fom m Y I e enlargement or shouldersocket Il for the recep- 23150nliltuoglttogi lg `tion of insulation material-to be described. The 4,5

tacles of the socket to illustrate how the ytube asini 531i rggxtggzrlo owlii or plug cnnetr cooperates with the socket in the socket is mounted.y Screw holes il are made lainovi'ei way to establish electric' connection as 'through the base s and pads '2 by .which .to m 5o Wm be explained' Y chor the socket 4'in stationary service position. 5@

.Figure 4 isf an undemeath' Plan- Vew ofi' the Into the holes l0 are inserted contact eyelet socket showing the assembly .of the sheet metal kreceptacles |9 0f tubular .form which are @pim Inductor-.Strips lC'Yl the elastic base v -down on each'end thereof to anchor theeyeleta n Figures 5 yanni "6 showa side `elevation and a in theelastic body. A lead-in conductor strip et cross-secticnnrespectvely vofthe molded elastic 20 is. made with anV aperture punched in'both se ends and one end is placed over the eyelet I9 bei'ore riveting or spinning down the said eyelet end and this operation very securely anchors that end of a conductor strip under the lower extremity of an eyelet I9. When the eyelet receptacles I9 have their extremities flared and spun outwardly to anchor sainel in the elastic and compressible base 9, it follows that the yieldable material is compressed in the region immediltely `adjacent the eyelet. This compression takes place by reason of the eyeleting tool or machine which insertsthe contacts I9 and when the socket is removed-from the eyeletingmachine there results an expansion of the rubber annularly around each eyelet I9 which expansion occurs along a line parallel to the .eyelet axis and this T.action positively forces the end of the conductor strip, against the eyelet head thereby producing positively hard pressed surface and electrical contact between the parts I9 and 29 so that the manufacturer of these sockets does not have to solder around the eyelet head adJac nt the conductor strip to produce a nished duct.

The molded elastic base 9, in some forms of the invention, may be made with an annular groove Il extending around the group of contact receptacles I9 cutting up into the body of the elastic base. In this way theholes III are placed in a central rubber mass I having subltantial bodyand thickness to better carry the contact parts I9, the portion I5 being ioined to the periphery of the elastic base by a relatively thin'annular portion I6 of increased elasticity by reason of its thinness. Thisthin annular connecting portion I6 thus mounts the rubber mass Il and contacts I9 in the center of the base 9 `with the result that this center portion is quite ilexible and yieldable, and the springiness and shock absorbing properties and the cushioning elect are increased by reason of the reduced amount oi material at the thin annular portion Il.

', Remembering that the periphery of the elastic base may be screwed down by or through its pads or feet I2, it is noted that a vacuum tube will readily bend or swing out\ of its normal vertical position under strain of one's hand which may accidently come into engagement therewith,

and the elasticity of the annular portion I6 quicklyireturns the tube to normal upright position. In other words, the periphery of the cushion socket, since it is screw fastened down in service position, may be more or less rigid, but this'rigidity does not extend to the central portion I9 because the base is elastic and particularly because of the annular groove Il which provides the thin elastic joining portion I6 which increases the elasticity at the center of the socket.

' The conductor strips 20 may to advantage be arched into the annular groove'll so as to increase somewhat their length thereby imparting flexibility thereto. The lead-in conductors 20 thus conform to the contour of the groove Il and have their other ends secured under the heads o1' lead-in terminals or binding post screws 2I, on the upper ends of each of which a nut 22 is mounted. The binding post nut 22 is tightened down on the ends of lead wires adapted to be connected with the cushion socket base receptacle. The arched or bowed flexible sheet metal part 20 bends and gives with the relative movement of the central rubber mass I 5.

An insulating washer of rubber, fibre, or other suitable material 24 is compressed into the socket II Just above and on top of the upper extremity ymouth of the contact receptacles I9. 'I'hus by of each contact eyelet receptacle I9. The insulating washer 2l thus seals over the upper end oi' the leyelet I9 and in eiIect embeds the eyelet in the compressible rubber mass I5. In this way, premature contact cannot be made when mount- 5 ing or plugging vacuum tubes into the socket, i. e. the voltage intended only for the .plate in a vacuum tube cannot be accidently impressed on the filament terminals of the tube which would destroy the vacuum tube, as is commonly known. This danger is avoided by sealing the upper ends of the contact eyelets in the elastic socket by the method of construction just explained or by other means.

f Figure 3,shows the lower end of an audion or vacuum tube the base of which is indicated at 26, and the contact pins or terminals 21 and'29 of which are shown fractionally out of alignment with the contact receptacle eyelets I9 so that it is seen that the vacuum tube may be plugged into the contact receptacles I9 of the cushion socket. 'I'his plugging in is accompanied by a novel mode oi' cooperation between the two electrical devices 26 and 9 because the elastic mass I5 must give slightly when the terminals 21 and 25 28 slide into the receptacles I9, thus causingv the insulating elastic member to exert a yielding contact pressure on and betweenthe cooperating contact parts. It is preferred that the center axes of the four contact eyelets I9 be either closer 30 togetheror further apart than the center axes of the vacuum tube terminal pins 21 and 2B. By thus manufacturing the socketr 9 with its contacts I9 slightly off center, either further apart or closer together, in respect to the push type terminals 21 and 29, which are standard as to spacing, it follows that the rubber cushion socket is subjected to compression or expansion when the device 29 is plugged into the socket 9. This action produces a frictional rubbing electrical contact between the two separable sets of contacts on the vacuum tube and socket, or between any other electrical plug-in device which may employ my principle.

By rei'erence to Figure 7, which is a diagram to 45 further illustrate the principles of the invention, there is shown in full lines the eyelet receptacles I9 together with terminals 21 and 28 yin dotted lines. These terminals 21 and 29 are exemplary of any electrical plug-ln device and are standard as to spacing and distance apart. One set ot terminals 21 has registered with one set of eyelets I9;-butit is observed that the terminals 29 rest slightly out of registration with their respective eyelet receptacles I9 with the result that 55 the pins 28 must be gently pressed or forced downwardly by sliding movement between the ends of the terminals and the upper ilared opening oi' the insulating libre washers 24 or flared 0 pressing the pins 21 and 29 into registration withthe four contact eyelets, it follows that compression of the central elastic mass I5 takes place thereby setting up a positive rubbing electric contact between the plug-in terminals of any electric plug and the contacts of the socket or base receptacle which produces positive electric contact without employing Ilexible metallic spring parts heretofore used.

It is noted therefore that I off-set from standard practice my contacts I9 in the elastic base, i. e. they are spaced apart slightly out of alignment with the jack prongs or plug-in blades 21 and 28 of all standard electrical plug connectors,

but the elasticity inherent in the base receptacle Vplug connecting functions.

itself permitsl the contacts toline up with 'alll standard plug connector jacks and contact blades.` d f It may be preferred to manufacture the receptacle with the eyelets I9 disposed on a circumference greater than that of the pin contacts 21 and 28 and this arrangement means that compression ofthe central region I5 of thesocket takes place as shown by the direction of the ar- -rows C indicating compression at thecenterof the cushion base, while slight stretching or yielding action occurs around the outer portion of the rubber base and this condition is indicated by arrows S.

Elastic and shock absorbing mounts for delicate vacuum tubes madey in accordance with my invention illls a long Lfelt want. *Many changes in form or size mayV be resorted to, but I retain the principle of employing contacts I9, which may be rigid or stiivin themselves, mounted in an elas# tic body by which the contacts, while in themselves rigid, are yrendered movable in function relatively to each other and relatively to rigid and immovable contacts such as found on vacuum tubes and a variety of other push plug connecting devices, all this by reason of the elasticity of the base member which exerts a yielding `contact pressure between the terminals of the vacuum tube and the contacts in the socket base. The principle of this invention is adapted to Yva,- rious and` sundry uses as regards electric push Referring now to liigure fthere is shown a second form of the invention comprising a vacuum tube support panel 33 provided with any suit- 'able number of `apertures 3l for the reception of cushion sockets made in accordance with my in-` vention. Reference isv made to `this view to explain a further improved construction and meth od of mounting the cushion socket in service posi;-

tion and this may be accomplished without the use ofA screws as will be understood.

An elastic disk-like circular plug or body 33 is made with an annular groove 34 formed in its periphery, the groove 34 being formed between adjacent parallel 'circular iianges. The groove 34 is adapted-to be pressed into'the apertures 3i in the bakelite or board panel 30 by springing back a flange to set the socket receptalcle 33 in the holes 3| of the panel, and in this way any suitable number of cushion sockets 33 are mounted in the panel 30. d l d Eyelet contact receptacles 36 and 31 are either anchored or moulded in the elastic socket member 33. A conductor strip 38 connects each eyelet with a lead-'in terminal or bindingpost screw ,33, and the conductor strip 38 is made in any suitable form to properly` connect the binding post terminal 39 with its respective eyelet receptacle 33. A good electrical connection is made between the conductor strips and the contact receptacles by reason of the expansion of the rubber which presses together the eyelet head and conductor lead-in strips. v Y

The upper surface of the elastic plug or socket base 33 is provided with a depressionp4I and the upper ends oi the eyelets 36 and 31 terminate in this depression. vThe upper eyelet` extremities are compressed into the rubber so that the upper surface of the depression 4I is ilush and smooth for the reception of aninsulating washer which covers the upper ends of lthe socket receptacle contacts. r y, d

A single insulatingwasher or cover 42 is placed in the rubber depression 4I over the several into the` contact receptacles 36 and 31.

. `WhatI claim is:

contact receptacles :t` and :1 and this par: may `be hard rubber, breor other suitable material.

This washer 42V seals in the top ends of the contacts which inV eect embeds them in theV elastic body 33, and the washer -42 has guide holes 43 5 for` the reception of pusheplug terminals, which guide holes are immediately above the contact receptacles 36 and 31 but maybe somewhat out of alignment therewith that is, eccentric with respect thereto because the guide holes 43 are rstandard spacing and the contacts 33 and 31 are not. The axis line 44, as an example. dennes the center 0I the insulating washer guide hole 43 while the axis line 45 deilnes the axis of the contact receptacle 31 and it is noted that the two 15 axes 44 and 45 are fractionally oil? -center and out offralignment with each other. In this form of the invention, the guide holes 43 preferably have a standardspacing, i. e. they are equal in dise tance to that of standard push-plug devices, 2o whilethe contact receptacles immediately underneath are slightly or fractionally diilerent from standard spacing so as to produce pressing or rubbing contact between' the cooperating parts when plug-in connection is made.

The fibre washer 42 does not interfere with the velasticity of the rubber mass immediately underneath thereof. Hence the `rubber base yields or compresses when the contact pins of the radio tube or any otherplug-in connection 30 are thrust through the guide insulating holes 43 It` is notedl therefore that the insulating holes 43 are rigidly spaced by which to guide the plug-in terminal pins or contact jacks into the contact 35 receptacles and as the pins 21 and 28 move through the holes 43 and come into engagement with the receptacles 36 and 31, the rubber compresses suiliciently to permit the axis of the holes 43 andzontact receptacles to line up. j 40 In accordance with the above, I employ as a `modified* form one rigid insulating cover 42 to seal in the several contact receptacles 36 and 31. 'I'he cover 42 is standard in form as to the spacing of the guide openings 43, while the elastical c ly mounted rigid contacts 36 and 31 areV not of standard spacing buttheymove slightly relatively to the cover. In other words, the contacts slide slightly under the cover 42 to accommodate themselves to the entering movement ,of the .push-plug terminals, the elasticity of the base material permitting the relative motion of the contacts under said-insulating cover 42.

-WhilevI `have disclosed the off-center or eccentric non-standard receptacle contacts em bedded in the integral rubber base and have exvplained how the elasticity of the base permits jing lterminalsof various electrical connecting devices. Whether or not the contact receptacles in the base are disposed crspaced apart according to standard practice, makes no diererlce,` particularly` as to the non-microphon'c cushion-` ing properties of a socket of this type for vacuum 73 tubes. Thatfeature and advantage is independ# l ent of all contact `making functions and is so considered in making claims to the several fea tures of this invention.

1.. An electric socket receptacle to receive terminals of push-plug connectors, an electric contact retaining base made of rubber and being elastic throughout, and contacts carried in the elastic base and normally out of alignment with standard push-plug connector terminals but capable of yielding relative motion in the elastic base to attain alignment and registration4 with said push-plug connectors.

2. An electric socket receptacle as defined in claim l but in which insulating means is placed on the base to conceal the contacts, and said insulating means provided with apertures leading to the contacts.

3. A n electric socket receptacle as defined in claim ibut in which a non-elastic insulating part is applied to the elastic base, said non-elastic insulating part having guide apertures of standard spacing being the same distance apart as terminals of push-plug connectors and thus being slightly out of alignment with but leading to the elastically mounted contacts.

4. In combination with rigid push-plug terminals which are ilxed and immovable in relation to each other on a movable body, a socket base into which the push-plug terminals are received to connect separable electric circuits yand said socket base including means for stationary service mounting, said socket base being made wholly oi elastic material, rigid contacts carried in the elastic socket base and spaced apart a distance fractionally diilerent from that of the rigid immovable push-plug terminals, and said rigid contact: being movable relatively to each otherwithln the elastic base when the push-plug terminals are engaged therewith.

5. In combination with ilxed push-plug terminals immovable in relation to each other on an electric fixture, an electric base receptacle made wholly oi' elastic material, rigid contacts carried in the elastic material base and spaced apart a distance fractionally different from that of the push-plug terminals but subject to yielding motion in relation to each other by. virtue of the elasticity of the base material, an insulating cover mounted on the elastic base to conceal the contacts, said insulating cover having guide holes spaced aparta distance equal to that of the push-plug terminals and adapted to'easily Areceive them, and sald'push-plug terminals acting to spring the rigid but elastically mounted contacts into alignment with the holes in the insulating cover and into alignment with said pushplug terminals by yielding of the elastic base.

6. An electric push-plug socket receptacle compricing, a base made of insulating material and holes molded therein to receive contacts, a contact part anchored in each hole, one end of the contact being embedded andconcealed below'the top surfaceof the base within said hole, elastic material surrounding the contact part which permits said contact to move relatively to and within the base, and non-elastic material carried bythe base immediately above 'the contact part and defining the hole and forming a guide aperture to the elastically mounted contact part.

'1. In combination with the rigid ystationary terminals of an electric vacuum tube, an elastic contact retaining base made whollyof elastic material, contacts carried in the elastic base, said contacts being spaced apart in the elastic` base a distance dlii'ering fractionally from the distance apart of the aforesaid rigid stationary terminals on the vacuum tube, and said contacts ot the .elastic base being adapted to move relatively therein to register with the rigid stationary terminals when the vacuum tube is plugged intolthe elastic base.

8. Mounting means for vacuum tubes comprising a base member made of elastic material in- 5 cluding means by which it is secured in stationary service position for the reception of a vacuum tube having-terminals, rigid contacts embedded in the elastic base and being movable in relation to each other by reason of the elasticity of said base, said contacts being spaced aparta distance diiiering fractionally from the terminals of the vacuum tube, and said contacts of the base being pressed into engagement with the terminals oi' the tube by reason of the elasticity of said base l5 member.

9. An electric plug connection for plug-in connectors comprising, a rubber base molded elasticaily in suitable shape with holes therein which are spaced apart a distance fractionally different irom'the plug-in connectors, contacts anchoredn in the holes and relatively movable by virtue of the elastic base which permits the contacts to be forced into alignment with plug-in connectors,

an insulating portion over the contacts, and said portion having guide apertures of standard spam ing leading to the contacts.

10. An electric base receptacle comprising; a single rubber body including a thick elastic'center, a thick perimeter, and a thinv elastic joining portion between the center and perimeter; .electric contacts anchored in the thick elastic center, lead-in terminals mounted on the perimeter, and an electric connection established between the lead-in terminals and the contacts.

il. The same structure as dened in claim 10 but modiiled as to the electric connection wherein said connection is a flexible part which extends across the thin elastic joining portion and is itself similarly elastic.

12. A socket including a soft rubber base, contacts carried in the center thereof, a deep annular groove being formed in the elastic base around the group of contacts which produces a thin annular portion integral with the center and the rest of the base of increased elasticity supporting the group of contacts in the center of the socket.

13. In combination with a panel member provided lwith a plurality oi' socket receiving means 50 formed therein, an elastic base mounted in the receiving means, and electric contacts molded in the elastic base and capable oi' motionrelativ-e to the panel and to each other.

14. rIn combination with a panel, having holes 5 for the reception of electric base receptacles or sockets, a rubber disk having annular parallel mountingflanges formed on its periphery and deilning therewith a deep groove which seats against the hole edge in the panel, and electric contact and lead means carried on the rubber disk.

15. Electric connecting means comprising, a metal contact part adapted to receive the terminal of an electrical device, a sott rubber elastic insulating body supporting the part and exerting a yielding contact pressure thereon, a. rigid insulating member carried on the elastic insulating body above the contact part, and said rigid insulating member having a guide hole eccentric to and leading to the contact part through which enters said terminal of the electrical device.

16. Electric connecting means comprising, an elastic insulating member capable oi compres? `sion and extension, a tubularfcontact. member embeddedtherein, and a rigid insulating member mounted in theelastic insulating member and provided 'with an aperture leading to the tubular'` '5 Vcontact member.. ,y Y

17. Electric connecting means comprising,` a" 4non-spring metal contact, ya soft rubber `elastic body in which isembedded the'contact, said elasticbodyacting to impart a yielding pressure to the non-spring contact, and a `hard `non-elastic insulating means within .the elastic body and havy ing a' guide entry hole eccentric Vto and leading `to thecontact 18. In combination, for radio apparatus, panel i l means provided with an aperturea resilient rubber body carried within the apertureand zelecftrical connection means mounted in the rubber y I 119. receptacle comprising an jelastic body having' groove means' formed onlitsiperimeter to secure it to asupporting meansfand electrical plug-.in contact means carried by the elastic body.

20.'. Anelectricalireceptacle comprisinga diskshaped circular elasticy rubber `member,hav ing a circumferential groove adapted to engage the edgev of-fan opening withina'.` support panel'tos mount said receptacle in servicevpositiomand( "electricaljcontaot means mounted in the rubber' member.: s

21.,A base receptacle for radio tubes; comprising a atfdisk-shaped resilient, rubber body of circular` form, said rubber bodyl beingprovided Y V 'with a circumferentialgroove moldedl therein and.

' f3? ta'cle to be pressed into a circular opening of av support, panel byV which said groove lsecures, the v receptacle in service position, auplurality of tudefined byanges which yield to adapt the recep- Vbillar cntactsextendingthru the rubberbody and open at each end to receivethecontact pins 4onel radio tube which'are adapted to beprog sectes nhruthenat rubber body andrresiiienuy,

`heldin place thereon, andv conductor strips adjaf `cent one surface of the rubber body and'attached to one open e'nd of the: tubular contacts byiwhich l .wiring vconnectionsarejestablished with the re- ,"ceptacle. l v1121).; Abase receptacleto receive radio tubes andl asupport panel, and tubular contacts secured in of'vsaid vradiotubes and the like."

the elastic memberto receive the contact prongs v,

: theflike,r comprising 'a circular V'elastic f member, :providedwitu va circumferential 'j groove molded f r i thereinto. engage the rim` offa hole formed in 23. *An eicuicai piugfin base rceptaue adapt` `ed tosupport plug-connecter means, comprising a circulardisk-shaped resilient rubber body hav- '.ing flat parallel surfaces, and providedjwith a. groove formed circumferentially between its par- 6 allel surfaces, contacts mountedin the rubber body and formed of tubular parts openingthru both surfaces of said rubber body, and flangedover ends `made at each extremity of the tubular 'contacts and compressed into the two surfaces'lo of the rubber body to anchor said contacts there- 24. 'An electrica plug-in base receptacle adapted to support plug-connecter means, comprising a circular disk-shapedsort rubber body having 15.

flat parallel surfaces, contacts mounted in the rubber body and formed of tubularparts opening,

thru "'.both surfaces of said rubbery body, and

. flanged-over ends made at each extremity o1' the tubular contacts and compressed into the two 20 surfaces ofthe rubberbodytoanchor said con.

' tacts therein.

Q25. A base receptacle for radio tubes, comprising a nat disk-shaped rubber resilient body of y circular form, means at the periphery thereof to secure the receptacle inservice position to a support, binding-post meanscarried thereon proximate thelperiphery of saidI rubber body, a plurality oftubular eyelet-contact means projectin thru the flat rubber body .fand opening at each end to provide `open contacts thru the receptacle, each lend ofthe tubular eyelet-contact means being shouldered down vonthe rubber body to compress the latter and anchorthe contacts in said rubber body, and conductor stripsstablish'. ingelectricalconnection between -the bindingpost means and the eyelets-contact means.

. i 26; An electric socket lreceptacle adapted to re- -jceive a number of electric terminals of a pushplug connector comprising, a base made o1' rubber Y and being elastic throughout, contacts carried by the .base;` and at leastone of said contacts in the basebeing normally outof alignmentv with at least one of the push-plug electric terminals with l which the latter is adaptedtobev engaged, but yielding as a consequence of the elastic base toy attain alignment andy sliding registration with said terminal, to thereby force `the other terminals of the push-plug connectorinto electrical engagement with the other contacts in said base.

HERMAN L. s'rRoNGsvoN.

gso 

